What size should I use for a 36 -11 casette?

Forgive me, but you are asking the wrong question.The cage size is controlled by the maximum amount of slack chain created by the combination of chain rings AND cassette. This is called "Chain Wrap".To formula for chain wrap is (Big Chain Ring - Small Chain Ring) + (Big cassette Cog - Small Cassette Cog). So if you are using a compact double chain ring (50-34) and a 11-36 cassette the numbers work out to (50 minus 34) + (36 minus 11) or 16 + 25 = 41. This means that if you shift from a big-big combination to a small-small combination, your derailleur has to be able to handle 41 teeth of loose chain, which calls for a long cage. On my bike a have a single 40 tooth chain ring and a 11-42 cassette so the chain wrap works out to (40 - 40) + (42 - 11) = 0 + 31 = 31. So even though I have a huge cassette I only need a medium cage because I have no front derailleur to create more chain wrap.Hope that helps.

what is short, medium.long cage?

It has to do with chain wrap capacity. Small=30t Chainwrap Capacity, Medium=35t, Long=47t. The wrap is just the difference between the number of chain ring teeth plus the difference between the cog teeth. For example a 53/39 with a 12-25 cassette requires 14 + 13 = 27 teeth of wrap capacity needed from the RD.

Will this work with Shimano Ultegra shifter

No, actuation will only work with sram.... The good news is that it will work with both sram 10 speed road and Mtb... Unlike the newer 11 speeds witch are road or mtb specific.

Can this be used with a shimano 11/42 cassette ?

I used it with a sunrace 11-42 cassette but I needed a longer b tension screw(which was not provided) so you will likely run into the same issue.

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🚵‍♀️ Shift into the future of trail dominance with SRAM GX Type 2.1!

TRAIL READY DESIGN - Built for unisex riders and all-season cycling, this derailleur is your go-to upgrade for dependable mountain biking.
10 SPEED POWERHOUSE - Seamlessly conquer trails with a drivetrain optimized for 10-speed performance, ensuring smooth transitions every ride.
LONG CAGE VERSATILITY - Designed to handle a 36-tooth cassette, this long cage derailleur adapts effortlessly to diverse mountain terrains.
LIGHTWEIGHT DURABILITY - Crafted from premium aluminum, it balances featherlight weight (0.4 kg) with rugged endurance for all your adventures.
PRECISION SHIFTING MASTERY - Experience flawless gear changes with SRAM’s Exact Actuation technology, engineered for millisecond accuracy.

The SRAM MTB GX Type 2.1 Long Cage Rear Derailleur is a precision-engineered 10-speed component featuring Exact Actuation technology for reliable, crisp shifting. Its long cage design supports up to a 36-tooth cassette, making it ideal for aggressive mountain biking. Constructed from lightweight aluminum, it offers durability without added weight, perfect for all-season, unisex use.

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Product dimensions	17.3L x 16.6W x 8.1H centimeters
Manufacturer	Sram MTB
UPC	757183591480 710845771835 784427964175
Global Trade Identification Number	00710845771835
Bike Type	mountain
Color	Black
Size	10 Speed
Style	Long
Weight	0.4 Kilograms
Material Type	Aluminum
Number of Items	1
Number of Pieces	1
Season	continuity 2015
Usage	cycling
Sport	Cycling
Batteries Included?	No
Department	Unisex
Item model number	00.7518.080.000
ASIN	B00V8RZ9SW

SramMTB Gx Type 2.1 Long Cage Rear Derailleur - Black, 10-Speed

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